We have recently ­received a big stash so get in touch if you want more. You won’t be disappointed

Brazen dealers are even selling the lethal substance online.

A Daily Star Sunday reporter arranged to buy the man-made narcotic known as mephedrone over the internet.

The former legal high was outlawed in April 2010 after it was linked to almost 100 deaths.

But police forces around the country have reported use of the drug is on the ­increase.

Last month, officers in Wales issued a warning about the Class B drug after a 15-year-old was admitted to hospital after taking it.

Yet the banned stimulant is easy to pick up and ruthless dealers are cashing in on its popularity. One website we spotted boasts that it has a new batch of ­mephedrone for sale and will send it straight to your door.

Our man called a contact number and set up a meeting for later that day.

In broad daylight on a busy main road an Eastern European man passed over a cigarette packet containing two grams of the white powder in exchange for £50.

The man in his 20s said he had a “big stash” of the drug and that it was “good”. He bragged that business was booming and he was cashing in on the demand.

He said: “This is pure. Good stuff. We’ve had no complaints. We have recently ­received a big stash so get in touch if you want more. You won’t be disappointed.”

The site offers two grams for £50, five for £80, and ten for £140, plus a £20 delivery charge. Mephedrone was originally ­manufactured as plant food and comes in the form of tablets or a powder which ­users swallow, snort or inject.

It produces similar effects to ecstasy, amphetamines and cocaine.

But the substance can have serious side effects and users can become paranoid, suffer nose bleeds, hallucinations, blood circulation problems, rashes, anxiety, fits, delusions and even heart attacks.

In 2010 a teenager on meow meow ripped off his own scrotum after a frenzied ­reaction to the drug.

Figures from South Wales Police last month show offences linked to ­mephedrone use had increased by more than 400% in 12 months.

Inspector Nick McLain, from Gwent Police, said: “There are some serious side-effects to using meow meow.

“These can include heart attack, ­seizures, sweating and paranoia.

“Apart from the health dangers, being caught in possession of meow meow could mean up to a five-year jail sentence.”

Our evidence is available to relevant ­authorities who may wish to investigate.